<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>title</title>
  <script>


    //console.log(/[a-zA-Z]+/.test("hello"));




//    console.log(/./.test("除了回车换行以为的任意字符"));//true
//    console.log(/.*/.test("0个到多个"));//true
//    console.log(/.+/.test("1个到多个"));//true
//    console.log(/.?/.test("哈哈"));//true
//    console.log(/[0-9]/.test("9527"));//true
//    console.log(/[a-z]/.test("what"));//true
//    console.log(/[A-Z]/.test("Are"));//true
//    console.log(/[a-zA-Z]/.test("干啥子"));//false
//    console.log(/[0-9a-zA-Z]/.test("9ebg"));//true
//    console.log(/b|(ara)/.test("abra"));//true
//    console.log(/[a-z]{2,3}/.test("arfsf"));//




    console.log(/\d/.test("998"));

    console.log(/\d*/.test("998"));

    console.log(/\d+/.test("998"));

    console.log(/\d{0,}/.test("998"));

    console.log(/\d{2,3}/.test("998"));

    console.log(/\D/.test("eat"));

    console.log(/\s/.test("  "));
    console.log(/\S/.test("嘎嘎 "));
    console.log(/\w/.test("_"));
    console.log(/\W/.test("_"));

  </script>
</head>
<body>


</body>
</html>